Guild Wars 2 will have a more dynamic game world in which quests will be more organically presented as problems within the world will often be visible and always be spoken about freely -- a dragon will be seen terrorizing the town and villagers will scream for a savior. On a similar note, the game world will visibly change based on whether missions are completed or failed -- if your group fails to repel troops outside of a town, they will create outposts closer to it, to the point where the fight may come into the village. This constantly-changing world should allow for much more exploration, the developers argue. To allow for better co-operation amongst the Guild Wars 2 consumers, the game will scale events and rewards on the fly depending on the amount of players actively participating.
The feature description, which can be read in full at the source link below, promises quite a bit of change in the world of MMORPGs from Guild Wars 2, which gives the game quite a standard to live up to. We'll fill you in more about these changes when we are able to finally observe them.
SOURCE: [Guild Wars 2 Official Website]